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observable

[uh b-zur-vuh-buh l] /əbˈzɜr və bəl/
adjective
1.
capable of being or liable to be observed; noticeable; visible; discernible:
an observable change in attitude.
2.
worthy or important enough to be celebrated, followed, or observed:
an observable holiday.
3.
deserving of attention; noteworthy.
Origin
1600-1610
1600-10; < Latin observābilis remarkable, equivalent to observā(re) to observe + -bilis -ble
Related forms
observability, observableness, noun
observably, adverb
nonobservable, adjective
nonobservably, adverb
unobservable, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for unobservable

observable

adj.

c.1600, from Latin observabilis "remarkable, observable," from observare (see observe). Related: Observably; observability.

Online Etymology Dictionary, © 2010 Douglas Harper
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unobservable in Science
observable
  (əb-zûr'və-bəl)   
A measurable property of a physical system, such as mass or momentum. In quantum mechanics, observables correspond to mathematical operators used in the calculation of measurable quantities. Operators that do not commute, having a nonzero commutator, correspond to observables that cannot be precisely measured at the same time, such as momentum and position. See also uncertainty principle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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